Question

A sample of hydrogen combusts, producing 1.00 kg of H2O (l). How many kJ of heat were released in the process

Answer 1

The amount of heat released in the combustion of hydrogen to produce 1.00 kg of water is 15,886.16 kJ.

Step-by-step explanation:

To calculate the amount of heat released in the combustion of hydrogen, we can use the information provided in the reference. According to the reference, the combustion of 1 mole of hydrogen gas releases 286 kJ of heat. Since we have 1.00 kg of H2O (l), we can convert the mass of water to moles using its molar mass. The molar mass of water is approximately 18 g/mol, so 1.00 kg of water is equivalent to 1000 g / 18 g/mol = 55.56 moles of water. Therefore, the amount of heat released in the combustion of hydrogen to produce 1.00 kg of water is 55.56 moles * 286 kJ/mol = 15,886.16 kJ.

Answer 2

Answer: The answer is 24.3 oC

Step-by-step explanation:

1)How many kJ of heat are released when 1.00 kg of H2 (g) combusts in the presence of excess oxygen? Answer kJ

2) A sample of hydrogen combusts, producing 1.00 kg of H2O (l). How many kJ of heat were released in the process? Answer kJ

3) How many grams of H2 must react to release 1.00 MJ of heat through the combustion process? Answer g H2

4) A ceramic coffee mug has a heat capacity, C, of 450 J/oC. How much heat, q, is required to raise the temperature, ΔT, of this coffee mug by 25 oC? Answer J

5) The specific heat of silver is 0.235 J/goC. How much heat is required to raise the temperature of 40.0 g of pure silver from 25.0 oC to 78.0 oC? Answer J

6) The specific heat of H2O(l) is 4.184 J / goC. How much heat is required to raise the temperature of 50.0 g of H2O(l) from 17.2 oC to 35.8 oC? Answer J

7) It required 317 J of heat to raise the temperature of a 52.1 g block of metal from 19.3 oC to 32.8 oC. What is the specific heat of this metal? Answer J/ goC

8) The specific heat of water is 4.184 J / goC. In an isolated system, a 9.01 g sample of hot metal at 72.3 oC is dropped into 28.2 g of water at 21.1 oC. The temperature of the water rises to 24.3 oC to reach thermal equilibrium. What is the specific heat of this metal? Answer J/ goC